Google did win because they were better. Now they're trying to maintain market share through other means to keep as much risk of competition at bay as possible

Google did win because they were better. Now they're trying to maintain market share through other means to keep as much risk of competition at bay as possible. That's where the anti-trust issues come into play, not on the question of whether Google is better. Ie Google leveraging their acquired scale, market power, to keep competition out to the extent possible (and obviously they could overreach to a greater extent, they could try to damage the competition even more dramatically, but that'd just make the case that much easier). You don't get to be the best and simultaneously use your market power to deny competition access to the market, generally. Intel vs AMD is a classic case of this in action. Intel in theory could have trivially owned the entire market, including eating Nvidia when they were far smaller. Intel had a huge size advantage over most every other semiconductor entity, for years (during the peak of their market position). They weren't allowed to do it, fortunately, due to anti-trust restrictions (either direct or perceived).